The number 680 is an integer that follows 679 and precedes 681. It is an even number, meaning it is divisible by 2 without a remainder. In terms of its prime factorization, 680 can be expressed as 2^3 × 5 × 17, indicating that it is made up of the prime numbers 2, 5, and 17. In the context of geography, 680 is also the area code for parts of California, specifically the region around San Francisco. Area codes are used in telephone numbering to designate specific geographic regions, helping to route calls efficiently.